Isel LES4, Assembly Instruction Manual, Page: 52 / 69

LES 4, 5, 6 - 234xxx xxxx
46 / 62 Assembly instruction
Belt drive modules
Fig. 22 - Mounting belt drive module
The picture above shows the assembly of a belt drive module. The pulleys must have the same pitch as the toothed
belt. Both shaft ends and the pulleys should be free of burrs, rust and dirt. As shaft-hub connection, we
recommend forceful connections using clamping bushes.
Before mounting the toothed belt and the belt pulleys, the shaft ends must be aligned. The installation of the
toothed belt must be carried out easily by hand. For this purpose, the centre distance must be reduced when using
on-board pulleys or both belt pulleys must be fitted together. Under no circumstances should the toothed belt be
forced onto the pulleys with force or mounting levers, as the belt can be damaged - often invisibly.
The pretension of the belt depends on the power to be transmitted and the drive characteristics. However, due to
the positive power transmission of the timing belt, only a low pretension is required. We recommend the use of
eccentric tension rollers to set the pretension or to correct tolerances.
Information
Too much pre-tension causes higher running noise, premature belt wear and can even lead to
the shaft ends tearing off. Too little pretension leads to synchronisation fluctuations and
promotes skipping of the belt teeth.
We give the following recommendation for adjusting
the preload:
●
Test force: F= 16,5N
●
Belt deflection: d=3,5mm
5.2 Commissioning
The linear unit LES is commissioned after the respective drive modules have been mounted and the necessary
cabling has been installed. To do this, follow the relevant instructions in the documentation of the motor modules,
power amplifiers or entire control system used.